71401554 has 64 divisors (see below), whose sum is σ = 185241600. Its totient is φ = 19961424.

The previous prime is 71401553. The next prime is 71401571. The reversal of 71401554 is 45510417.

It is a happy number.

71401554 is a `hidden beast` number, since 71 + 40 + 1 + 554 = 666.

It is a super-3 number, since 3×71401554³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71401553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15757 + ... + 19775.

It is an arithmetic number, because the mean of its divisors is an integer number (2894400).

Almost surely, 2^71401554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71401554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92620800).

71401554 is an abundant number, since it is smaller than the sum of its proper divisors (113840046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71401554 is a wasteful number, since it uses less digits than its factorization.

71401554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084 (or 4078 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 71401554 is about 8449.9440234832. The cubic root of 71401554 is about 414.8609472682.

The spelling of 71401554 in words is "seventy-one million, four hundred one thousand, five hundred fifty-four".